Roughly 90 percent of Tokyo's 13.1 million residents commute to work each day by rail, with a third of those riding their bikes on the "last mile" to and from the train station. The result: as many as 3.5 million bikes left illegally parked on city streets every day, crowding already packed sidewalks and exposing… »12/04/12 4:40pm 12/04/12 4:40pm